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android_frameworks_base/services/input/EventHub.cpp
Jeff Brown 2717eff2ac Query input device for initial slot index. 
This fixes a problem where touches can get stuck because the
driver and the framework have different ideas of what the
initial slot index is.  The framework assumed it was slot 0
but it could in principle be any slot, such as slot 1.  When
that happened, the framework would start tracking the first
touch as slot 0, but it might never receive an "up" for that slot.

Change-Id: Idaffc4534b275d66b9d4360987b28dc2d0f63218
2011-07-01 02:59:26 -07:00

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/*
* Copyright (C) 2005 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "EventHub"
// #define LOG_NDEBUG 0
#include "EventHub.h"
#include <hardware_legacy/power.h>
#include <cutils/properties.h>
#include <utils/Log.h>
#include <utils/Timers.h>
#include <utils/threads.h>
#include <utils/Errors.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <memory.h>
#include <errno.h>
#include <assert.h>
#include <ui/KeyLayoutMap.h>
#include <ui/KeyCharacterMap.h>
#include <ui/VirtualKeyMap.h>
#include <string.h>
#include <stdint.h>
#include <dirent.h>
#include <sys/inotify.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <sys/limits.h>
/* this macro is used to tell if "bit" is set in "array"
* it selects a byte from the array, and does a boolean AND
* operation with a byte that only has the relevant bit set.
* eg. to check for the 12th bit, we do (array[1] & 1<<4)
*/
#define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
/* this macro computes the number of bytes needed to represent a bit array of the specified size */
#define sizeof_bit_array(bits) ((bits + 7) / 8)
#define INDENT " "
#define INDENT2 " "
#define INDENT3 " "
namespace android {
static const char *WAKE_LOCK_ID = "KeyEvents";
static const char *DEVICE_PATH = "/dev/input";
/* return the larger integer */
static inline int max(int v1, int v2)
{
return (v1 > v2) ? v1 : v2;
}
static inline const char* toString(bool value) {
return value ? "true" : "false";
}
// --- EventHub::Device ---
EventHub::Device::Device(int fd, int32_t id, const String8& path,
const InputDeviceIdentifier& identifier) :
next(NULL),
fd(fd), id(id), path(path), identifier(identifier),
classes(0), configuration(NULL), virtualKeyMap(NULL) {
memset(keyBitmask, 0, sizeof(keyBitmask));
memset(absBitmask, 0, sizeof(absBitmask));
memset(relBitmask, 0, sizeof(relBitmask));
memset(swBitmask, 0, sizeof(swBitmask));
memset(ledBitmask, 0, sizeof(ledBitmask));
memset(propBitmask, 0, sizeof(propBitmask));
}
EventHub::Device::~Device() {
close();
delete configuration;
delete virtualKeyMap;
}
void EventHub::Device::close() {
if (fd >= 0) {
::close(fd);
fd = -1;
}
}
// --- EventHub ---
const uint32_t EventHub::EPOLL_ID_INOTIFY;
const uint32_t EventHub::EPOLL_ID_WAKE;
const int EventHub::EPOLL_SIZE_HINT;
const int EventHub::EPOLL_MAX_EVENTS;
EventHub::EventHub(void) :
mBuiltInKeyboardId(-1), mNextDeviceId(1),
mOpeningDevices(0), mClosingDevices(0),
mNeedToSendFinishedDeviceScan(false),
mNeedToReopenDevices(false), mNeedToScanDevices(true),
mPendingEventCount(0), mPendingEventIndex(0), mPendingINotify(false) {
acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
mNumCpus = sysconf(_SC_NPROCESSORS_ONLN);
mEpollFd = epoll_create(EPOLL_SIZE_HINT);
LOG_ALWAYS_FATAL_IF(mEpollFd < 0, "Could not create epoll instance. errno=%d", errno);
mINotifyFd = inotify_init();
int result = inotify_add_watch(mINotifyFd, DEVICE_PATH, IN_DELETE | IN_CREATE);
LOG_ALWAYS_FATAL_IF(result < 0, "Could not register INotify for %s. errno=%d",
DEVICE_PATH, errno);
struct epoll_event eventItem;
memset(&eventItem, 0, sizeof(eventItem));
eventItem.events = EPOLLIN;
eventItem.data.u32 = EPOLL_ID_INOTIFY;
result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mINotifyFd, &eventItem);
LOG_ALWAYS_FATAL_IF(result != 0, "Could not add INotify to epoll instance. errno=%d", errno);
int wakeFds[2];
result = pipe(wakeFds);
LOG_ALWAYS_FATAL_IF(result != 0, "Could not create wake pipe. errno=%d", errno);
mWakeReadPipeFd = wakeFds[0];
mWakeWritePipeFd = wakeFds[1];
result = fcntl(mWakeReadPipeFd, F_SETFL, O_NONBLOCK);
LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake read pipe non-blocking. errno=%d",
errno);
result = fcntl(mWakeWritePipeFd, F_SETFL, O_NONBLOCK);
LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake write pipe non-blocking. errno=%d",
errno);
eventItem.data.u32 = EPOLL_ID_WAKE;
result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mWakeReadPipeFd, &eventItem);
LOG_ALWAYS_FATAL_IF(result != 0, "Could not add wake read pipe to epoll instance. errno=%d",
errno);
}
EventHub::~EventHub(void) {
closeAllDevicesLocked();
while (mClosingDevices) {
Device* device = mClosingDevices;
mClosingDevices = device->next;
delete device;
}
::close(mEpollFd);
::close(mINotifyFd);
::close(mWakeReadPipeFd);
::close(mWakeWritePipeFd);
release_wake_lock(WAKE_LOCK_ID);
}
String8 EventHub::getDeviceName(int32_t deviceId) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device == NULL) return String8();
return device->identifier.name;
}
uint32_t EventHub::getDeviceClasses(int32_t deviceId) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device == NULL) return 0;
return device->classes;
}
void EventHub::getConfiguration(int32_t deviceId, PropertyMap* outConfiguration) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->configuration) {
*outConfiguration = *device->configuration;
} else {
outConfiguration->clear();
}
}
status_t EventHub::getAbsoluteAxisInfo(int32_t deviceId, int axis,
RawAbsoluteAxisInfo* outAxisInfo) const {
outAxisInfo->clear();
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device == NULL) return -1;
struct input_absinfo info;
if(ioctl(device->fd, EVIOCGABS(axis), &info)) {
LOGW("Error reading absolute controller %d for device %s fd %d, errno=%d",
axis, device->identifier.name.string(), device->fd, errno);
return -errno;
}
if (info.minimum != info.maximum) {
outAxisInfo->valid = true;
outAxisInfo->minValue = info.minimum;
outAxisInfo->maxValue = info.maximum;
outAxisInfo->flat = info.flat;
outAxisInfo->fuzz = info.fuzz;
outAxisInfo->resolution = info.resolution;
}
return OK;
}
bool EventHub::hasRelativeAxis(int32_t deviceId, int axis) const {
if (axis >= 0 && axis <= REL_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->relBitmask) {
return test_bit(axis, device->relBitmask);
}
}
return false;
}
bool EventHub::hasInputProperty(int32_t deviceId, int property) const {
if (property >= 0 && property <= INPUT_PROP_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->propBitmask) {
return test_bit(property, device->propBitmask);
}
}
return false;
}
int32_t EventHub::getScanCodeState(int32_t deviceId, int32_t scanCode) const {
if (scanCode >= 0 && scanCode <= KEY_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return getScanCodeStateLocked(device, scanCode);
}
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getScanCodeStateLocked(Device* device, int32_t scanCode) const {
uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)];
memset(key_bitmask, 0, sizeof(key_bitmask));
if (ioctl(device->fd,
EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) {
return test_bit(scanCode, key_bitmask) ? AKEY_STATE_DOWN : AKEY_STATE_UP;
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getKeyCodeState(int32_t deviceId, int32_t keyCode) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return getKeyCodeStateLocked(device, keyCode);
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getKeyCodeStateLocked(Device* device, int32_t keyCode) const {
if (!device->keyMap.haveKeyLayout()) {
return AKEY_STATE_UNKNOWN;
}
Vector<int32_t> scanCodes;
device->keyMap.keyLayoutMap->findScanCodesForKey(keyCode, &scanCodes);
uint8_t key_bitmask[sizeof_bit_array(KEY_MAX + 1)];
memset(key_bitmask, 0, sizeof(key_bitmask));
if (ioctl(device->fd, EVIOCGKEY(sizeof(key_bitmask)), key_bitmask) >= 0) {
#if 0
for (size_t i=0; i<=KEY_MAX; i++) {
LOGI("(Scan code %d: down=%d)", i, test_bit(i, key_bitmask));
}
#endif
const size_t N = scanCodes.size();
for (size_t i=0; i<N && i<=KEY_MAX; i++) {
int32_t sc = scanCodes.itemAt(i);
//LOGI("Code %d: down=%d", sc, test_bit(sc, key_bitmask));
if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, key_bitmask)) {
return AKEY_STATE_DOWN;
}
}
return AKEY_STATE_UP;
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getSwitchState(int32_t deviceId, int32_t sw) const {
if (sw >= 0 && sw <= SW_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return getSwitchStateLocked(device, sw);
}
}
return AKEY_STATE_UNKNOWN;
}
int32_t EventHub::getSwitchStateLocked(Device* device, int32_t sw) const {
uint8_t sw_bitmask[sizeof_bit_array(SW_MAX + 1)];
memset(sw_bitmask, 0, sizeof(sw_bitmask));
if (ioctl(device->fd,
EVIOCGSW(sizeof(sw_bitmask)), sw_bitmask) >= 0) {
return test_bit(sw, sw_bitmask) ? AKEY_STATE_DOWN : AKEY_STATE_UP;
}
return AKEY_STATE_UNKNOWN;
}
status_t EventHub::getAbsoluteAxisValue(int32_t deviceId, int32_t axis, int32_t* outValue) const {
if (axis >= 0 && axis <= ABS_MAX) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return getAbsoluteAxisValueLocked(device, axis, outValue);
}
}
*outValue = 0;
return -1;
}
status_t EventHub::getAbsoluteAxisValueLocked(Device* device, int32_t axis,
int32_t* outValue) const {
struct input_absinfo info;
if(ioctl(device->fd, EVIOCGABS(axis), &info)) {
LOGW("Error reading absolute controller %d for device %s fd %d, errno=%d",
axis, device->identifier.name.string(), device->fd, errno);
return -errno;
}
*outValue = info.value;
return OK;
}
bool EventHub::markSupportedKeyCodes(int32_t deviceId, size_t numCodes,
const int32_t* keyCodes, uint8_t* outFlags) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device != NULL) {
return markSupportedKeyCodesLocked(device, numCodes, keyCodes, outFlags);
}
return false;
}
bool EventHub::markSupportedKeyCodesLocked(Device* device, size_t numCodes,
const int32_t* keyCodes, uint8_t* outFlags) const {
if (!device->keyMap.haveKeyLayout()) {
return false;
}
Vector<int32_t> scanCodes;
for (size_t codeIndex = 0; codeIndex < numCodes; codeIndex++) {
scanCodes.clear();
status_t err = device->keyMap.keyLayoutMap->findScanCodesForKey(
keyCodes[codeIndex], &scanCodes);
if (! err) {
// check the possible scan codes identified by the layout map against the
// map of codes actually emitted by the driver
for (size_t sc = 0; sc < scanCodes.size(); sc++) {
if (test_bit(scanCodes[sc], device->keyBitmask)) {
outFlags[codeIndex] = 1;
break;
}
}
}
}
return true;
}
status_t EventHub::mapKey(int32_t deviceId, int scancode,
int32_t* outKeycode, uint32_t* outFlags) const
{
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapKey(scancode, outKeycode, outFlags);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
if (mBuiltInKeyboardId != -1) {
device = getDeviceLocked(mBuiltInKeyboardId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapKey(scancode, outKeycode, outFlags);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
}
*outKeycode = 0;
*outFlags = 0;
return NAME_NOT_FOUND;
}
status_t EventHub::mapAxis(int32_t deviceId, int scancode, AxisInfo* outAxisInfo) const
{
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapAxis(scancode, outAxisInfo);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
if (mBuiltInKeyboardId != -1) {
device = getDeviceLocked(mBuiltInKeyboardId);
if (device && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapAxis(scancode, outAxisInfo);
if (err == NO_ERROR) {
return NO_ERROR;
}
}
}
return NAME_NOT_FOUND;
}
void EventHub::setExcludedDevices(const Vector<String8>& devices) {
AutoMutex _l(mLock);
mExcludedDevices = devices;
}
bool EventHub::hasLed(int32_t deviceId, int32_t led) const {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && led >= 0 && led <= LED_MAX) {
if (test_bit(led, device->ledBitmask)) {
return true;
}
}
return false;
}
void EventHub::setLedState(int32_t deviceId, int32_t led, bool on) {
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && led >= 0 && led <= LED_MAX) {
struct input_event ev;
ev.time.tv_sec = 0;
ev.time.tv_usec = 0;
ev.type = EV_LED;
ev.code = led;
ev.value = on ? 1 : 0;
ssize_t nWrite;
do {
nWrite = write(device->fd, &ev, sizeof(struct input_event));
} while (nWrite == -1 && errno == EINTR);
}
}
void EventHub::getVirtualKeyDefinitions(int32_t deviceId,
Vector<VirtualKeyDefinition>& outVirtualKeys) const {
outVirtualKeys.clear();
AutoMutex _l(mLock);
Device* device = getDeviceLocked(deviceId);
if (device && device->virtualKeyMap) {
outVirtualKeys.appendVector(device->virtualKeyMap->getVirtualKeys());
}
}
EventHub::Device* EventHub::getDeviceLocked(int32_t deviceId) const {
if (deviceId == 0) {
deviceId = mBuiltInKeyboardId;
}
ssize_t index = mDevices.indexOfKey(deviceId);
return index >= 0 ? mDevices.valueAt(index) : NULL;
}
EventHub::Device* EventHub::getDeviceByPathLocked(const char* devicePath) const {
for (size_t i = 0; i < mDevices.size(); i++) {
Device* device = mDevices.valueAt(i);
if (device->path == devicePath) {
return device;
}
}
return NULL;
}
size_t EventHub::getEvents(int timeoutMillis, RawEvent* buffer, size_t bufferSize) {
LOG_ASSERT(bufferSize >= 1);
AutoMutex _l(mLock);
struct input_event readBuffer[bufferSize];
RawEvent* event = buffer;
size_t capacity = bufferSize;
bool awoken = false;
for (;;) {
nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
// Reopen input devices if needed.
if (mNeedToReopenDevices) {
mNeedToReopenDevices = false;
LOGI("Reopening all input devices due to a configuration change.");
closeAllDevicesLocked();
mNeedToScanDevices = true;
break; // return to the caller before we actually rescan
}
// Report any devices that had last been added/removed.
while (mClosingDevices) {
Device* device = mClosingDevices;
LOGV("Reporting device closed: id=%d, name=%s\n",
device->id, device->path.string());
mClosingDevices = device->next;
event->when = now;
event->deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id;
event->type = DEVICE_REMOVED;
event += 1;
delete device;
mNeedToSendFinishedDeviceScan = true;
if (--capacity == 0) {
break;
}
}
if (mNeedToScanDevices) {
mNeedToScanDevices = false;
scanDevicesLocked();
mNeedToSendFinishedDeviceScan = true;
}
while (mOpeningDevices != NULL) {
Device* device = mOpeningDevices;
LOGV("Reporting device opened: id=%d, name=%s\n",
device->id, device->path.string());
mOpeningDevices = device->next;
event->when = now;
event->deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id;
event->type = DEVICE_ADDED;
event += 1;
mNeedToSendFinishedDeviceScan = true;
if (--capacity == 0) {
break;
}
}
if (mNeedToSendFinishedDeviceScan) {
mNeedToSendFinishedDeviceScan = false;
event->when = now;
event->type = FINISHED_DEVICE_SCAN;
event += 1;
if (--capacity == 0) {
break;
}
}
// Grab the next input event.
bool deviceChanged = false;
while (mPendingEventIndex < mPendingEventCount) {
const struct epoll_event& eventItem = mPendingEventItems[mPendingEventIndex++];
if (eventItem.data.u32 == EPOLL_ID_INOTIFY) {
if (eventItem.events & EPOLLIN) {
mPendingINotify = true;
} else {
LOGW("Received unexpected epoll event 0x%08x for INotify.", eventItem.events);
}
continue;
}
if (eventItem.data.u32 == EPOLL_ID_WAKE) {
if (eventItem.events & EPOLLIN) {
LOGV("awoken after wake()");
awoken = true;
char buffer[16];
ssize_t nRead;
do {
nRead = read(mWakeReadPipeFd, buffer, sizeof(buffer));
} while ((nRead == -1 && errno == EINTR) || nRead == sizeof(buffer));
} else {
LOGW("Received unexpected epoll event 0x%08x for wake read pipe.",
eventItem.events);
}
continue;
}
ssize_t deviceIndex = mDevices.indexOfKey(eventItem.data.u32);
if (deviceIndex < 0) {
LOGW("Received unexpected epoll event 0x%08x for unknown device id %d.",
eventItem.events, eventItem.data.u32);
continue;
}
Device* device = mDevices.valueAt(deviceIndex);
if (eventItem.events & EPOLLIN) {
int32_t readSize = read(device->fd, readBuffer,
sizeof(struct input_event) * capacity);
if (readSize == 0 || (readSize < 0 && errno == ENODEV)) {
// Device was removed before INotify noticed.
deviceChanged = true;
closeDeviceLocked(device);
} else if (readSize < 0) {
if (errno != EAGAIN && errno != EINTR) {
LOGW("could not get event (errno=%d)", errno);
}
} else if ((readSize % sizeof(struct input_event)) != 0) {
LOGE("could not get event (wrong size: %d)", readSize);
} else {
int32_t deviceId = device->id == mBuiltInKeyboardId ? 0 : device->id;
size_t count = size_t(readSize) / sizeof(struct input_event);
for (size_t i = 0; i < count; i++) {
const struct input_event& iev = readBuffer[i];
LOGV("%s got: t0=%d, t1=%d, type=%d, code=%d, value=%d",
device->path.string(),
(int) iev.time.tv_sec, (int) iev.time.tv_usec,
iev.type, iev.code, iev.value);
#ifdef HAVE_POSIX_CLOCKS
// Use the time specified in the event instead of the current time
// so that downstream code can get more accurate estimates of
// event dispatch latency from the time the event is enqueued onto
// the evdev client buffer.
//
// The event's timestamp fortuitously uses the same monotonic clock
// time base as the rest of Android. The kernel event device driver
// (drivers/input/evdev.c) obtains timestamps using ktime_get_ts().
// The systemTime(SYSTEM_TIME_MONOTONIC) function we use everywhere
// calls clock_gettime(CLOCK_MONOTONIC) which is implemented as a
// system call that also queries ktime_get_ts().
event->when = nsecs_t(iev.time.tv_sec) * 1000000000LL
+ nsecs_t(iev.time.tv_usec) * 1000LL;
LOGV("event time %lld, now %lld", event->when, now);
#else
event->when = now;
#endif
event->deviceId = deviceId;
event->type = iev.type;
event->scanCode = iev.code;
event->value = iev.value;
event->keyCode = AKEYCODE_UNKNOWN;
event->flags = 0;
if (iev.type == EV_KEY && device->keyMap.haveKeyLayout()) {
status_t err = device->keyMap.keyLayoutMap->mapKey(iev.code,
&event->keyCode, &event->flags);
LOGV("iev.code=%d keyCode=%d flags=0x%08x err=%d\n",
iev.code, event->keyCode, event->flags, err);
}
event += 1;
}
capacity -= count;
if (capacity == 0) {
// The result buffer is full. Reset the pending event index
// so we will try to read the device again on the next iteration.
mPendingEventIndex -= 1;
break;
}
}
} else {
LOGW("Received unexpected epoll event 0x%08x for device %s.",
eventItem.events, device->identifier.name.string());
}
}
// readNotify() will modify the list of devices so this must be done after
// processing all other events to ensure that we read all remaining events
// before closing the devices.
if (mPendingINotify && mPendingEventIndex >= mPendingEventCount) {
mPendingINotify = false;
readNotifyLocked();
deviceChanged = true;
}
// Report added or removed devices immediately.
if (deviceChanged) {
continue;
}
// Return now if we have collected any events or if we were explicitly awoken.
if (event != buffer || awoken) {
break;
}
// Poll for events. Mind the wake lock dance!
// We hold a wake lock at all times except during epoll_wait(). This works due to some
// subtle choreography. When a device driver has pending (unread) events, it acquires
// a kernel wake lock. However, once the last pending event has been read, the device
// driver will release the kernel wake lock. To prevent the system from going to sleep
// when this happens, the EventHub holds onto its own user wake lock while the client
// is processing events. Thus the system can only sleep if there are no events
// pending or currently being processed.
//
// The timeout is advisory only. If the device is asleep, it will not wake just to
// service the timeout.
mPendingEventIndex = 0;
mLock.unlock(); // release lock before poll, must be before release_wake_lock
release_wake_lock(WAKE_LOCK_ID);
int pollResult = epoll_wait(mEpollFd, mPendingEventItems, EPOLL_MAX_EVENTS, timeoutMillis);
acquire_wake_lock(PARTIAL_WAKE_LOCK, WAKE_LOCK_ID);
mLock.lock(); // reacquire lock after poll, must be after acquire_wake_lock
if (pollResult == 0) {
// Timed out.
mPendingEventCount = 0;
break;
}
if (pollResult < 0) {
// An error occurred.
mPendingEventCount = 0;
// Sleep after errors to avoid locking up the system.
// Hopefully the error is transient.
if (errno != EINTR) {
LOGW("poll failed (errno=%d)\n", errno);
usleep(100000);
}
} else {
// Some events occurred.
mPendingEventCount = size_t(pollResult);
// On an SMP system, it is possible for the framework to read input events
// faster than the kernel input device driver can produce a complete packet.
// Because poll() wakes up as soon as the first input event becomes available,
// the framework will often end up reading one event at a time until the
// packet is complete. Instead of one call to read() returning 71 events,
// it could take 71 calls to read() each returning 1 event.
//
// Sleep for a short period of time after waking up from the poll() to give
// the kernel time to finish writing the entire packet of input events.
if (mNumCpus > 1) {
usleep(250);
}
}
}
// All done, return the number of events we read.
return event - buffer;
}
void EventHub::wake() {
LOGV("wake() called");
ssize_t nWrite;
do {
nWrite = write(mWakeWritePipeFd, "W", 1);
} while (nWrite == -1 && errno == EINTR);
if (nWrite != 1 && errno != EAGAIN) {
LOGW("Could not write wake signal, errno=%d", errno);
}
}
void EventHub::scanDevicesLocked() {
status_t res = scanDirLocked(DEVICE_PATH);
if(res < 0) {
LOGE("scan dir failed for %s\n", DEVICE_PATH);
}
}
// ----------------------------------------------------------------------------
static bool containsNonZeroByte(const uint8_t* array, uint32_t startIndex, uint32_t endIndex) {
const uint8_t* end = array + endIndex;
array += startIndex;
while (array != end) {
if (*(array++) != 0) {
return true;
}
}
return false;
}
static const int32_t GAMEPAD_KEYCODES[] = {
AKEYCODE_BUTTON_A, AKEYCODE_BUTTON_B, AKEYCODE_BUTTON_C,
AKEYCODE_BUTTON_X, AKEYCODE_BUTTON_Y, AKEYCODE_BUTTON_Z,
AKEYCODE_BUTTON_L1, AKEYCODE_BUTTON_R1,
AKEYCODE_BUTTON_L2, AKEYCODE_BUTTON_R2,
AKEYCODE_BUTTON_THUMBL, AKEYCODE_BUTTON_THUMBR,
AKEYCODE_BUTTON_START, AKEYCODE_BUTTON_SELECT, AKEYCODE_BUTTON_MODE,
AKEYCODE_BUTTON_1, AKEYCODE_BUTTON_2, AKEYCODE_BUTTON_3, AKEYCODE_BUTTON_4,
AKEYCODE_BUTTON_5, AKEYCODE_BUTTON_6, AKEYCODE_BUTTON_7, AKEYCODE_BUTTON_8,
AKEYCODE_BUTTON_9, AKEYCODE_BUTTON_10, AKEYCODE_BUTTON_11, AKEYCODE_BUTTON_12,
AKEYCODE_BUTTON_13, AKEYCODE_BUTTON_14, AKEYCODE_BUTTON_15, AKEYCODE_BUTTON_16,
};
status_t EventHub::openDeviceLocked(const char *devicePath) {
char buffer[80];
LOGV("Opening device: %s", devicePath);
int fd = open(devicePath, O_RDWR);
if(fd < 0) {
LOGE("could not open %s, %s\n", devicePath, strerror(errno));
return -1;
}
InputDeviceIdentifier identifier;
// Get device name.
if(ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer) < 1) {
//fprintf(stderr, "could not get device name for %s, %s\n", devicePath, strerror(errno));
} else {
buffer[sizeof(buffer) - 1] = '\0';
identifier.name.setTo(buffer);
}
// Check to see if the device is on our excluded list
for (size_t i = 0; i < mExcludedDevices.size(); i++) {
const String8& item = mExcludedDevices.itemAt(i);
if (identifier.name == item) {
LOGI("ignoring event id %s driver %s\n", devicePath, item.string());
close(fd);
return -1;
}
}
// Get device driver version.
int driverVersion;
if(ioctl(fd, EVIOCGVERSION, &driverVersion)) {
LOGE("could not get driver version for %s, %s\n", devicePath, strerror(errno));
close(fd);
return -1;
}
// Get device identifier.
struct input_id inputId;
if(ioctl(fd, EVIOCGID, &inputId)) {
LOGE("could not get device input id for %s, %s\n", devicePath, strerror(errno));
close(fd);
return -1;
}
identifier.bus = inputId.bustype;
identifier.product = inputId.product;
identifier.vendor = inputId.vendor;
identifier.version = inputId.version;
// Get device physical location.
if(ioctl(fd, EVIOCGPHYS(sizeof(buffer) - 1), &buffer) < 1) {
//fprintf(stderr, "could not get location for %s, %s\n", devicePath, strerror(errno));
} else {
buffer[sizeof(buffer) - 1] = '\0';
identifier.location.setTo(buffer);
}
// Get device unique id.
if(ioctl(fd, EVIOCGUNIQ(sizeof(buffer) - 1), &buffer) < 1) {
//fprintf(stderr, "could not get idstring for %s, %s\n", devicePath, strerror(errno));
} else {
buffer[sizeof(buffer) - 1] = '\0';
identifier.uniqueId.setTo(buffer);
}
// Make file descriptor non-blocking for use with poll().
if (fcntl(fd, F_SETFL, O_NONBLOCK)) {
LOGE("Error %d making device file descriptor non-blocking.", errno);
close(fd);
return -1;
}
// Allocate device. (The device object takes ownership of the fd at this point.)
int32_t deviceId = mNextDeviceId++;
Device* device = new Device(fd, deviceId, String8(devicePath), identifier);
#if 0
LOGI("add device %d: %s\n", deviceId, devicePath);
LOGI(" bus: %04x\n"
" vendor %04x\n"
" product %04x\n"
" version %04x\n",
identifier.bus, identifier.vendor, identifier.product, identifier.version);
LOGI(" name: \"%s\"\n", identifier.name.string());
LOGI(" location: \"%s\"\n", identifier.location.string());
LOGI(" unique id: \"%s\"\n", identifier.uniqueId.string());
LOGI(" driver: v%d.%d.%d\n",
driverVersion >> 16, (driverVersion >> 8) & 0xff, driverVersion & 0xff);
#endif
// Load the configuration file for the device.
loadConfigurationLocked(device);
// Figure out the kinds of events the device reports.
ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(device->keyBitmask)), device->keyBitmask);
ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(device->absBitmask)), device->absBitmask);
ioctl(fd, EVIOCGBIT(EV_REL, sizeof(device->relBitmask)), device->relBitmask);
ioctl(fd, EVIOCGBIT(EV_SW, sizeof(device->swBitmask)), device->swBitmask);
ioctl(fd, EVIOCGBIT(EV_LED, sizeof(device->ledBitmask)), device->ledBitmask);
ioctl(fd, EVIOCGPROP(sizeof(device->propBitmask)), device->propBitmask);
// See if this is a keyboard. Ignore everything in the button range except for
// joystick and gamepad buttons which are handled like keyboards for the most part.
bool haveKeyboardKeys = containsNonZeroByte(device->keyBitmask, 0, sizeof_bit_array(BTN_MISC))
|| containsNonZeroByte(device->keyBitmask, sizeof_bit_array(KEY_OK),
sizeof_bit_array(KEY_MAX + 1));
bool haveGamepadButtons = containsNonZeroByte(device->keyBitmask, sizeof_bit_array(BTN_MISC),
sizeof_bit_array(BTN_MOUSE))
|| containsNonZeroByte(device->keyBitmask, sizeof_bit_array(BTN_JOYSTICK),
sizeof_bit_array(BTN_DIGI));
if (haveKeyboardKeys || haveGamepadButtons) {
device->classes |= INPUT_DEVICE_CLASS_KEYBOARD;
}
// See if this is a cursor device such as a trackball or mouse.
if (test_bit(BTN_MOUSE, device->keyBitmask)
&& test_bit(REL_X, device->relBitmask)
&& test_bit(REL_Y, device->relBitmask)) {
device->classes |= INPUT_DEVICE_CLASS_CURSOR;
}
// See if this is a touch pad.
// Is this a new modern multi-touch driver?
if (test_bit(ABS_MT_POSITION_X, device->absBitmask)
&& test_bit(ABS_MT_POSITION_Y, device->absBitmask)) {
// Some joysticks such as the PS3 controller report axes that conflict
// with the ABS_MT range. Try to confirm that the device really is
// a touch screen.
if (test_bit(BTN_TOUCH, device->keyBitmask) || !haveGamepadButtons) {
device->classes |= INPUT_DEVICE_CLASS_TOUCH | INPUT_DEVICE_CLASS_TOUCH_MT;
}
// Is this an old style single-touch driver?
} else if (test_bit(BTN_TOUCH, device->keyBitmask)
&& test_bit(ABS_X, device->absBitmask)
&& test_bit(ABS_Y, device->absBitmask)) {
device->classes |= INPUT_DEVICE_CLASS_TOUCH;
}
// See if this device is a joystick.
// Ignore touchscreens because they use the same absolute axes for other purposes.
// Assumes that joysticks always have gamepad buttons in order to distinguish them
// from other devices such as accelerometers that also have absolute axes.
if (haveGamepadButtons
&& !(device->classes & INPUT_DEVICE_CLASS_TOUCH)
&& containsNonZeroByte(device->absBitmask, 0, sizeof_bit_array(ABS_MAX + 1))) {
device->classes |= INPUT_DEVICE_CLASS_JOYSTICK;
}
// Check whether this device has switches.
for (int i = 0; i <= SW_MAX; i++) {
if (test_bit(i, device->swBitmask)) {
device->classes |= INPUT_DEVICE_CLASS_SWITCH;
break;
}
}
// Configure virtual keys.
if ((device->classes & INPUT_DEVICE_CLASS_TOUCH)) {
// Load the virtual keys for the touch screen, if any.
// We do this now so that we can make sure to load the keymap if necessary.
status_t status = loadVirtualKeyMapLocked(device);
if (!status) {
device->classes |= INPUT_DEVICE_CLASS_KEYBOARD;
}
}
// Load the key map.
// We need to do this for joysticks too because the key layout may specify axes.
status_t keyMapStatus = NAME_NOT_FOUND;
if (device->classes & (INPUT_DEVICE_CLASS_KEYBOARD | INPUT_DEVICE_CLASS_JOYSTICK)) {
// Load the keymap for the device.
keyMapStatus = loadKeyMapLocked(device);
}
// Configure the keyboard, gamepad or virtual keyboard.
if (device->classes & INPUT_DEVICE_CLASS_KEYBOARD) {
// Set system properties for the keyboard.
setKeyboardPropertiesLocked(device, false);
// Register the keyboard as a built-in keyboard if it is eligible.
if (!keyMapStatus
&& mBuiltInKeyboardId == -1
&& isEligibleBuiltInKeyboard(device->identifier,
device->configuration, &device->keyMap)) {
mBuiltInKeyboardId = device->id;
setKeyboardPropertiesLocked(device, true);
}
// 'Q' key support = cheap test of whether this is an alpha-capable kbd
if (hasKeycodeLocked(device, AKEYCODE_Q)) {
device->classes |= INPUT_DEVICE_CLASS_ALPHAKEY;
}
// See if this device has a DPAD.
if (hasKeycodeLocked(device, AKEYCODE_DPAD_UP) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_DOWN) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_LEFT) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_RIGHT) &&
hasKeycodeLocked(device, AKEYCODE_DPAD_CENTER)) {
device->classes |= INPUT_DEVICE_CLASS_DPAD;
}
// See if this device has a gamepad.
for (size_t i = 0; i < sizeof(GAMEPAD_KEYCODES)/sizeof(GAMEPAD_KEYCODES[0]); i++) {
if (hasKeycodeLocked(device, GAMEPAD_KEYCODES[i])) {
device->classes |= INPUT_DEVICE_CLASS_GAMEPAD;
break;
}
}
}
// If the device isn't recognized as something we handle, don't monitor it.
if (device->classes == 0) {
LOGV("Dropping device: id=%d, path='%s', name='%s'",
deviceId, devicePath, device->identifier.name.string());
delete device;
return -1;
}
// Determine whether the device is external or internal.
if (isExternalDeviceLocked(device)) {
device->classes |= INPUT_DEVICE_CLASS_EXTERNAL;
}
// Register with epoll.
struct epoll_event eventItem;
memset(&eventItem, 0, sizeof(eventItem));
eventItem.events = EPOLLIN;
eventItem.data.u32 = deviceId;
if (epoll_ctl(mEpollFd, EPOLL_CTL_ADD, fd, &eventItem)) {
LOGE("Could not add device fd to epoll instance. errno=%d", errno);
delete device;
return -1;
}
LOGI("New device: id=%d, fd=%d, path='%s', name='%s', classes=0x%x, "
"configuration='%s', keyLayout='%s', keyCharacterMap='%s', builtinKeyboard=%s",
deviceId, fd, devicePath, device->identifier.name.string(),
device->classes,
device->configurationFile.string(),
device->keyMap.keyLayoutFile.string(),
device->keyMap.keyCharacterMapFile.string(),
toString(mBuiltInKeyboardId == deviceId));
mDevices.add(deviceId, device);
device->next = mOpeningDevices;
mOpeningDevices = device;
return 0;
}
void EventHub::loadConfigurationLocked(Device* device) {
device->configurationFile = getInputDeviceConfigurationFilePathByDeviceIdentifier(
device->identifier, INPUT_DEVICE_CONFIGURATION_FILE_TYPE_CONFIGURATION);
if (device->configurationFile.isEmpty()) {
LOGD("No input device configuration file found for device '%s'.",
device->identifier.name.string());
} else {
status_t status = PropertyMap::load(device->configurationFile,
&device->configuration);
if (status) {
LOGE("Error loading input device configuration file for device '%s'. "
"Using default configuration.",
device->identifier.name.string());
}
}
}
status_t EventHub::loadVirtualKeyMapLocked(Device* device) {
// The virtual key map is supplied by the kernel as a system board property file.
String8 path;
path.append("/sys/board_properties/virtualkeys.");
path.append(device->identifier.name);
if (access(path.string(), R_OK)) {
return NAME_NOT_FOUND;
}
return VirtualKeyMap::load(path, &device->virtualKeyMap);
}
status_t EventHub::loadKeyMapLocked(Device* device) {
return device->keyMap.load(device->identifier, device->configuration);
}
void EventHub::setKeyboardPropertiesLocked(Device* device, bool builtInKeyboard) {
int32_t id = builtInKeyboard ? 0 : device->id;
android::setKeyboardProperties(id, device->identifier,
device->keyMap.keyLayoutFile, device->keyMap.keyCharacterMapFile);
}
void EventHub::clearKeyboardPropertiesLocked(Device* device, bool builtInKeyboard) {
int32_t id = builtInKeyboard ? 0 : device->id;
android::clearKeyboardProperties(id);
}
bool EventHub::isExternalDeviceLocked(Device* device) {
if (device->configuration) {
bool value;
if (device->configuration->tryGetProperty(String8("device.internal"), value)
&& value) {
return false;
}
}
return device->identifier.bus == BUS_USB || device->identifier.bus == BUS_BLUETOOTH;
}
bool EventHub::hasKeycodeLocked(Device* device, int keycode) const {
if (!device->keyMap.haveKeyLayout() || !device->keyBitmask) {
return false;
}
Vector<int32_t> scanCodes;
device->keyMap.keyLayoutMap->findScanCodesForKey(keycode, &scanCodes);
const size_t N = scanCodes.size();
for (size_t i=0; i<N && i<=KEY_MAX; i++) {
int32_t sc = scanCodes.itemAt(i);
if (sc >= 0 && sc <= KEY_MAX && test_bit(sc, device->keyBitmask)) {
return true;
}
}
return false;
}
status_t EventHub::closeDeviceByPathLocked(const char *devicePath) {
Device* device = getDeviceByPathLocked(devicePath);
if (device) {
closeDeviceLocked(device);
return 0;
}
LOGV("Remove device: %s not found, device may already have been removed.", devicePath);
return -1;
}
void EventHub::closeAllDevicesLocked() {
while (mDevices.size() > 0) {
closeDeviceLocked(mDevices.valueAt(mDevices.size() - 1));
}
}
void EventHub::closeDeviceLocked(Device* device) {
LOGI("Removed device: path=%s name=%s id=%d fd=%d classes=0x%x\n",
device->path.string(), device->identifier.name.string(), device->id,
device->fd, device->classes);
if (device->id == mBuiltInKeyboardId) {
LOGW("built-in keyboard device %s (id=%d) is closing! the apps will not like this",
device->path.string(), mBuiltInKeyboardId);
mBuiltInKeyboardId = -1;
clearKeyboardPropertiesLocked(device, true);
}
clearKeyboardPropertiesLocked(device, false);
if (epoll_ctl(mEpollFd, EPOLL_CTL_DEL, device->fd, NULL)) {
LOGW("Could not remove device fd from epoll instance. errno=%d", errno);
}
mDevices.removeItem(device->id);
device->close();
// Unlink for opening devices list if it is present.
Device* pred = NULL;
bool found = false;
for (Device* entry = mOpeningDevices; entry != NULL; ) {
if (entry == device) {
found = true;
break;
}
pred = entry;
entry = entry->next;
}
if (found) {
// Unlink the device from the opening devices list then delete it.
// We don't need to tell the client that the device was closed because
// it does not even know it was opened in the first place.
LOGI("Device %s was immediately closed after opening.", device->path.string());
if (pred) {
pred->next = device->next;
} else {
mOpeningDevices = device->next;
}
delete device;
} else {
// Link into closing devices list.
// The device will be deleted later after we have informed the client.
device->next = mClosingDevices;
mClosingDevices = device;
}
}
status_t EventHub::readNotifyLocked() {
int res;
char devname[PATH_MAX];
char *filename;
char event_buf[512];
int event_size;
int event_pos = 0;
struct inotify_event *event;
LOGV("EventHub::readNotify nfd: %d\n", mINotifyFd);
res = read(mINotifyFd, event_buf, sizeof(event_buf));
if(res < (int)sizeof(*event)) {
if(errno == EINTR)
return 0;
LOGW("could not get event, %s\n", strerror(errno));
return -1;
}
//printf("got %d bytes of event information\n", res);
strcpy(devname, DEVICE_PATH);
filename = devname + strlen(devname);
*filename++ = '/';
while(res >= (int)sizeof(*event)) {
event = (struct inotify_event *)(event_buf + event_pos);
//printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
if(event->len) {
strcpy(filename, event->name);
if(event->mask & IN_CREATE) {
openDeviceLocked(devname);
} else {
closeDeviceByPathLocked(devname);
}
}
event_size = sizeof(*event) + event->len;
res -= event_size;
event_pos += event_size;
}
return 0;
}
status_t EventHub::scanDirLocked(const char *dirname)
{
char devname[PATH_MAX];
char *filename;
DIR *dir;
struct dirent *de;
dir = opendir(dirname);
if(dir == NULL)
return -1;
strcpy(devname, dirname);
filename = devname + strlen(devname);
*filename++ = '/';
while((de = readdir(dir))) {
if(de->d_name[0] == '.' &&
(de->d_name[1] == '\0' ||
(de->d_name[1] == '.' && de->d_name[2] == '\0')))
continue;
strcpy(filename, de->d_name);
openDeviceLocked(devname);
}
closedir(dir);
return 0;
}
void EventHub::requestReopenDevices() {
LOGV("requestReopenDevices() called");
AutoMutex _l(mLock);
mNeedToReopenDevices = true;
}
void EventHub::dump(String8& dump) {
dump.append("Event Hub State:\n");
{ // acquire lock
AutoMutex _l(mLock);
dump.appendFormat(INDENT "BuiltInKeyboardId: %d\n", mBuiltInKeyboardId);
dump.append(INDENT "Devices:\n");
for (size_t i = 0; i < mDevices.size(); i++) {
const Device* device = mDevices.valueAt(i);
if (mBuiltInKeyboardId == device->id) {
dump.appendFormat(INDENT2 "%d: %s (aka device 0 - built-in keyboard)\n",
device->id, device->identifier.name.string());
} else {
dump.appendFormat(INDENT2 "%d: %s\n", device->id,
device->identifier.name.string());
}
dump.appendFormat(INDENT3 "Classes: 0x%08x\n", device->classes);
dump.appendFormat(INDENT3 "Path: %s\n", device->path.string());
dump.appendFormat(INDENT3 "Location: %s\n", device->identifier.location.string());
dump.appendFormat(INDENT3 "UniqueId: %s\n", device->identifier.uniqueId.string());
dump.appendFormat(INDENT3 "Identifier: bus=0x%04x, vendor=0x%04x, "
"product=0x%04x, version=0x%04x\n",
device->identifier.bus, device->identifier.vendor,
device->identifier.product, device->identifier.version);
dump.appendFormat(INDENT3 "KeyLayoutFile: %s\n",
device->keyMap.keyLayoutFile.string());
dump.appendFormat(INDENT3 "KeyCharacterMapFile: %s\n",
device->keyMap.keyCharacterMapFile.string());
dump.appendFormat(INDENT3 "ConfigurationFile: %s\n",
device->configurationFile.string());
}
} // release lock
}
}; // namespace android
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